module Gosu
  class Color
    # Setting up for YAML
    YAML_DOMAIN = 'libgosu.org,2010'
    YAML_TYPE = 'color'

    YAML::add_domain_type(YAML_DOMAIN, YAML_TYPE) do |type, value|
      p type, value
      Gosu::Color.new(*value[:rgba])
    end

    def to_yaml
      "--- #{to_yaml_type} \nrgba: [#{red}, #{green}, #{blue}, #{alpha}]\n"
    end

    def to_yaml_type
      "!#{YAML_DOMAIN}/#{YAML_TYPE}"
    end
  end
end

Gosu::Color.new(1, 2, 3, 4).to_yaml
YAML.load(Gosu::Color.new(1, 2, 3, 4).to_yaml)